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Related Concept Videos

Myasthenia Gravis ll: Pathophysiology01:22

Myasthenia Gravis ll: Pathophysiology

The disease process of myasthenia gravis begins at the neuromuscular junction, where antibodies attack key proteins needed for muscle activation. This immune reaction weakens signal transmission, leading to the characteristic muscle fatigue and weakness that define the condition.Immune-Mediated DamageIn most individuals, antibodies target acetylcholine receptors (AChRs) on the postsynaptic membrane of muscle cells. By blocking acetylcholine binding, these antibodies prevent the nerve signal...
Myocarditis I: Introduction01:21

Myocarditis I: Introduction

Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
Myasthenia Gravis: Overview and Treatment01:20

Myasthenia Gravis: Overview and Treatment

Myasthenia gravis is a neuromuscular transmission disorder characterized by weakness and increased fatigability of skeletal muscles. It is an autoimmune disease affecting approximately one in 2000 people, where antibodies against the α1 subunit of nicotinic acetylcholine receptors are produced.
These antibodies interfere with the function of the nicotinic receptors in three ways: by binding to the receptor and disrupting acetylcholine binding; by causing cross-linking of receptors which leads...
Alterations in Muscle Tone lll01:11

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...
Myocarditis II: Clinical Features and Diagnostic Tests01:27

Myocarditis II: Clinical Features and Diagnostic Tests

Myocarditis is an inflammation of the heart muscle. The symptoms vary widely, encompassing asymptomatic presentations to severe, acute manifestations.Clinical PresentationAsymptomatic cases: In some instances, myocarditis may be asymptomatic, with the infection resolving without intervention. These cases often go undetected unless discovered incidentally through diagnostic imaging or tests conducted for other reasons.General Early Symptoms: Early symptoms of myocarditis are non-specific and can...

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Related Experiment Video

Updated: Jun 19, 2026

Vascular Occlusion Training for Inclusion Body Myositis: A Novel Therapeutic Approach
09:01

Vascular Occlusion Training for Inclusion Body Myositis: A Novel Therapeutic Approach

Published on: June 5, 2010

Inclusion body myositis: old and new concepts.

A A Amato1, R J Barohn

  • 1Department of Neurology, Brigham and Women's Hospital, Harvard Medical School, 75 Francis St, Boston, MA 02115, USA. aamato@partners.org

Journal of Neurology, Neurosurgery, and Psychiatry
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Inclusion body myositis (IBM) is a common muscle disorder in older adults, characterized by progressive weakness. Current understanding of IBM pathogenesis remains incomplete, necessitating further research for effective therapies.

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Immunolabelling Myofiber Degeneration in Muscle Biopsies
06:37

Immunolabelling Myofiber Degeneration in Muscle Biopsies

Published on: December 5, 2019

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Last Updated: Jun 19, 2026

Vascular Occlusion Training for Inclusion Body Myositis: A Novel Therapeutic Approach
09:01

Vascular Occlusion Training for Inclusion Body Myositis: A Novel Therapeutic Approach

Published on: June 5, 2010

Immunolabelling Myofiber Degeneration in Muscle Biopsies
06:37

Immunolabelling Myofiber Degeneration in Muscle Biopsies

Published on: December 5, 2019

Area of Science:

  • Neurology
  • Immunology
  • Muscle Biology

Background:

  • Inclusion body myositis (IBM) is the most frequent idiopathic inflammatory myopathy in individuals over 50.
  • It represents approximately 30% of all inflammatory myopathy cases.
  • Characteristic muscle biopsy findings include endomysial inflammation, atrophic fibers, and rimmed vacuoles, though these may be absent.

Purpose of the Study:

  • To summarize the key clinical and pathological features of Inclusion body myositis.
  • To discuss the current understanding and challenges in the pathogenesis of IBM.
  • To highlight the need for further research and clinical trials for IBM treatment.

Main Methods:

  • Review of clinical and histopathological characteristics of IBM.
  • Discussion of proposed pathogenetic mechanisms, including the beta-amyloid theory.
  • Analysis of therapeutic challenges and future research directions.

Main Results:

  • IBM presents with early, often asymmetrical weakness and atrophy, particularly in quadriceps and forearm flexors.
  • Pathogenesis is uncertain, with theories including autoimmune or degenerative processes.
  • A prevailing theory involves beta-amyloid precursor protein overproduction, though it has limitations.

Conclusions:

  • IBM diagnosis often relies on clinical examination due to variable biopsy findings.
  • The underlying cause of IBM remains unknown, hindering therapeutic development.
  • Further research and robust clinical trials are crucial for advancing IBM understanding and treatment.